8th MAPEX Early Career Researcher Workshop

Programme 29th April 2019 TAB Building

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8th MAPEX Early Career Researcher Workshop

PROGRAMME - overview

8:30 Registration and poster mounting 9:00 Session 1

10:30 Coffee break 10:45 Session 2 12:15 Poster session and lunch 13:15 Session 3 14:30 Poster session and coffee break 15:00 Plenary lecture 16:00 Discussion and coffee

Get together

17:00 Minigolf (Zum Platzhirsch, Kuhgrabenweg 30) 18:00 Dinner restaurant Zum Platzhirsch (at your own expense)

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Session 1 09:00 Welcome

Hanna Lührs, MAPEX Lucio Colombi Ciacchi, FB04, University of Bremen

09:15 From gold recovery to cancer detection: Dielectrophoresis for

material-selective particle separation Georg Pesch, FB04, University of Bremen

Dielectrophoresis is a versatile electro-kinetic phenomenon used to solve different particle separation tasks, for example in material recycling. This talk shows recovery of micron-sized gold from plastic particles using the novel high-throughput method of dielectrophoretic filtration. It further outlines how this technique can be used in biomedical applications, for instance for the detection of circulating tumor cells in blood. 09:45 Support of early-career researchers at the University of Bremen

Imke Girßmann, BYRD 10:00 Flashlight presentations L1 Photocatalytic Activity of a Zinc(II) Phthalocyanine Derivative

Immobilized on Various Nanoporous Gold Supports David Steinebrunner, FB02, University of Bremen

Novel photocatalytically active hybrid materials consisting of ZnPc immobilized on various npAu supports were synthesized and analyzed regarding their structural differences and activity in singlet oxygen formation. The hybrid materials were more active than the same amount of ZnPc in solution indicating a synergistic effect, which was further investigated by irradiation with different wavelengths to achieve selective excitation of the ZnPc, the npAu supports or both components simultaneously. L2 Nanoporous gold: Tuning of catalytic properties by surface

modification Jorge Adrian Tapia Burgos, FB02, University of Bremen

Nanoporous gold (npAu), can be prepared by leaching a less noble Au alloy component out of the alloy. Residual metal in the material has been found to participate in the reaction by activating molecular oxygen depending on its amount. NpAu will be synthesized by dealloying of AuCu alloys, as the Cu shows good reactivity towards oxygen species, and compared to npAu prepared from AuAg. The objective is the optimization of npAu obtained by dealloying AuCu and to perform model-catalytic studies.

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8th MAPEX Early Career Researcher Workshop

L3 In-Situ Characterization and Thermal Decomposition Behavior of Ammonium-Exchanged FAU Type Zeolites

Ahmed Gadelmawla, FB05, University of Bremen

Ammonium-exchanged zeolites, where the NH4+ ion represents the charge-compensating cation, play an important role as precursor materials in the production synthesis of H-zeolites. The hydrogen zeolites can be used as catalysts with their protons acting as Brønsted acid sites. Here, we present results on NH4-exchanged natural faujasite and synthetic FAU-type zeolites X and Y within the framework of a project studying the mechanisms of deammoniation processes in zeolites by in situ methods. L4 Crystal growth, crystal structure and optical characterization of

CsMTiO4 (M = Al, Fe and Ga) and CsTiSi2O6.5 crystals with tetrahedrally coordinated titanium Ti4+

Jan Derk, FB05, University of Bremen

Electronic polarizabilities are of interest for predicting different physical properties. In this work, the empirical electronic polarizability of Ti4+ tetrahedrally coordinated by oxygen ([4]Ti4+) was investigated. Therefore, four different crystals (CsMTiO4 (M = Al, Fe, Ga) and CsTiSi2O6.5) containing [4]Ti4+ were synthesized and chemically, structurally and optically characterized. The investigations resulted in a derived electronic polarizability of <α [4]Ti4+> = 5.1875 [Å3]. 10:30 Discussion and coffee

Session 2 10:45 High-performance composite materials for additive manufacturing

Ilya Okulov, FB04, IWT Additive manufacturing is currently shaping our world. The first part of the presentation focuses on general introduction into additive manufacturing. Thereafter, its most important aspect – the design of new materials – is discussed and several useful tips for design are given. The selected examples of materials design for additive manufacturing (including speaker’s one) finally demonstrates the beauty of this revolutionary technology.

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11:15 Science benefits from diversity Nele Kuhn, Diversity Management, University of Bremen

Acknowledgement of diversity is both an important condition as well as a sound framework for excellence in research; promoting innovation, creativity, and problem solving. An explicit consideration and inclusion of diverse potentials and perspectives in research fosters excellence, widening participation and sustainability alike. We will look at four core fields of implementation: The recruitment of diverse excellent researchers, diversity competences in a diverse working group, leadership and diversity, as well as the consideration of diversity issues in research activities. 11:45 Flashlight presentations L5 CoDaPro - Configurable High Throughput Data Processing

Christina Plump, FB03, University of Bremen

The intent of the collaborative research center SFB1232 (Farbige Zustände) is to implement a new method to explore evolutionary materials. The success of this method in part relies on the rapid testing and quick analysis of micro-samples. CoDaPro realizes a configurable component-based architecture and is stream-based, which leads to a quick evaluation performance even when facing huge amounts of data. L6 Molecular dynamics study of hybrid interfaces

Lena Weber, FB01, University of Bremen

Enzyme-coated ceramics are in great demand in medical diagnostics and for biotechnological applications. Still the surface effects are often not yet clear and thus set limits to the optimization of the processes. In MD simulations, influences such as the symmetry of the adsorbate are discussed as well as effects of surface chemistry by pH or salt concentration. In particular, the simulation results of two proteins, CHT and LYZ on alumina compared to other ceramics are presented. L7 Interaction between water contaminants and amorphous TiO2

surfaces Manuela Romero, FB04, University of Bremen

Amorphous models of TiO2 surfaces at different pH values are simulated using Molecular Mechanics. Force - Distance curves examining the surface are carried out.

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8th MAPEX Early Career Researcher Workshop

L8 Identification of native defects in MoTe2 monolayers - A DFT study Eric Macke, FB04, University of Bremen

Defects play a decisive role for future technological applications of 2D transition-metal dichalcogenides (TMD). Using first principle methods, we attempt to identify defect structures that have been observed experimentally on MoTe2 monolayer surfaces with Scanning Tunnelling Spectroscopy. We carry out Density Functional Theory calculations that include spin-orbit coupling effects. With that, we generate maps of the Local Density of States in order to compare them to the experimental results.

Poster session and lunch 12:15 Poster session and lunch

Session 3 13:15 Flashlight presentations L9 Potential of rotary swaging

Yang Liu, FB04, bime, University of Bremen

Rotary swaging is an incremental forming process to manufacture axisymmetric components. The process changes the geometry, surface and the microture of the parts. Based on the process parameters it is possible to control the part properties. By using flat dies and adapted process kinematics, a polygonal geometry can be achieved with reduced martensitic ratio. In FEM it is shown that with feed per stroke and friction conditions the material flow and final residual stress can be influenced. L10 Impulse forming: extending material limitations

Björn Beckschwarte, FB04, bime, University of Bremen

Impulse forming like electromagnetic and electrohydraulic forming is a technology facing limitations of conventional forming process. The impulse is extending material limitations in sense of workpiece plasticity and tooling flexibility. During impulse forming material behaviour changes due to dynamic load application. Thus, impulse forming is applied for a wide range of applications. These applications are researched from pulse generation as a driving mechanism to process strategy and tooling. L11 Experimental investigation of mixing in a T-shaped mixer

Huixin Li, FB04, ZARM, University of Bremen

Fluid mixing is ubiquitous and indispensable in processes engineering. We experimentally study the mixing dynamics of liquids in a T-mixer for different Reynolds numbers. The accurate measurements of small-scale dynamics and scale interactions by non-intrusive techniques (particle image velocimetry and planar laser-induced fluorescence), will facilitate the understanding of the micro mixing which is between the smallest fluid velocity lengthscales and the smallest mixing scalar lengthscales.

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13:30 Publish or perish: Good scientific practice in times of open access, predatory publishers and preprint archives

Benjamin Ahlborn, State and University Library Bremen (SUUB) Publishing is still the linchpin of scholarly communication, but most content is behind publishers' paywalls. Funders are putting increased pressure on both scholars and publishers to make scientifc results available in open access. This talk will adress questions of "green" OA self archiving, "golden" OA publication fees and the chances and pitfalls of publishing Open Access. 14:00 Flashlight presentations L12 Composites at high dynamic loads – material studies on explosion

protection by Steel-FRP-Sandwiches Jan Yorrick Dietrich, FB04, University of Bremen

Dual protection concepts for combined blast and impact scenarios are theoretically discussed, tested in radial contact detonations and analyzed by elastic-plastic dynamic and plastic static deformation as well as visual inspection and put into relation to simple compression wave propagation theory as well as basic static material properties. L13 A process to realize direct laser written electrostatic actuator

elements in a closed microcavity Sina Reede, FB01, IMSAS, University of Bremen

An electrostatic actuator made by 2-photon polymerization and integrated in a microcavity is presented. The cavity is closed by low-temperature wafer-to-wafer bonding of Parylene-C coated silicon and glass wafers. The actuator consists of a free-standing, electrically connected, movable platform with an outer diameter of 260 µm which can act as a microfluidic valve and is supported by springs. The process includes the patterning of metal on the glass wafer containing 76 µm high structures. L14 Nanofluid Thermal Conductivity Dependency Using Multivariate

Analysis Julia Tielke, FB04, ZARM, University of Bremen

The Thermal Conductivity of heat transfer fluids can be increased by the addition of nanoparticles. These dispersions are known as Nanofluids. We generated a database containing experimental data and modeled the effective thermal conductivity of different nanofluids with respect to concentration, particle size, temperature, and material.

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8th MAPEX Early Career Researcher Workshop

L15 Macroscopic model for flows in porous media based on the pore scale prevalence

Feixiong Rao, FB04, ZARM, University of Bremen

A porous media consists of a solid matrix with an interconnected void. Brinkman term is added to Darcy equation in no-slip boundary condition due to momentum dispersion. However, due to complex geometries, it is difficult to deal with the boundary condition in porous media. Being different to Brinkman term, this paper derives one new model according to Navier-Stokes equations. This new model is more precise and reasonable. L16 Direct Numerical Simulation and Modeling of Turbulent Convection

in Porous Media Stefan Gasow, FB04, University of Bremen

The purpose of this project is to better understand the physics of turbulent convection in porous media. In order to attain this objective, microscopic direct numerical simulation methods, in which the detailed flows within the porous elements are taken into account, are used. The final aim of this project is to develop a more accurate macroscopic model for calculating turbulent porous medium convection.

Poster session and coffee 14:30 Poster session and coffee

Notes …

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15:00 Plenary lecture

Recent advances in gear manufacturing Prof. Dr.-Ing. habil. Prof. h.c. Dr. h.c. Dr. h.c. Bernhard Karpuschewski

Leibniz Institute for Materials Engineering IWT karpuschewski@iwt-bremen.de

Gears are known as being one of the eldest machine elements of mankind. Already more than 2300 years ago human beings made use of the concept of interacting teeth in rotational coupling of axes. Since then enormous progress was made regarding the improvement, understanding and capabilities of gears. Nowadays some critical voices are questioning the future of gears and even name them “dinosaurs”, i.e. they claim that these essential parts are in danger of extinction from the technical world. In this presentation the attempt will be made to highlight the importance of gears and the recent progress that was achieved in manufacturing of these highly relevant machine elements. Aspects of current research regarding soft machining, heat treatment and finishing with different state-of-the-art manufacturing processes will be discussed, taking into account the possibilities to support experimental work on these complex geometries by process adapted process modelling and simulation. Just a look at the broad variety of manufacturing options to realise a gear as shown in Fig. 1 is reflecting the still existing global importance of gears. The ultimate aim of this presentation is to emphasize the current and also future dominating role of this machine element.

Fig. 1: Available process chains for gear manufacturing.

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8th MAPEX Early Career Researcher Workshop

Locations Scientific programme 9:00 – 16:00

TAB building Am Fallturm 1

Entrance F

Social event and dinner

17:00 Minigolf (Zum Platzhirsch, Kuhgrabenweg 30) 18:00 Dinner restaurant Zum Platzhirsch (at your own expense)

Organizing committee Hanna Lührs, MAPEX Eric Macke, ProMat Britta Hinz, MAPEX Jan Yorrick Dietrich, ProMat Bastian Dincher, photographer Hanfang Ma, MAPEX

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List of Participants 1. Alexander Adam, Fraunhofer IFAM 2. Benjamin Ahlborn, State and University Library Bremen (SUUB) 3. Karim Altona, FB05, University of Bremen 4. Kerstin Avila, FB04, University of Bremen 5. Bastian Bäuerlein, FB04, ZARM, University of Bremen 6. Suleyman Bayrak, FB04, Fraunhofer IFAM 7. Björn Beckschwarte, FB04, bime, University of Bremen 8. Martin Castillo, FB04, ZARM, University of Bremen 9. Dhia Charni, FB04, University of Bremen 10. Lucio Colombi Ciacchi, FB04, University of Bremen 11. Jan Derk, FB05, University of Bremen 12. Jan Yorrick Dietrich, FB04, University of Bremen 13. Bastian Dincher, photographer 14. Michael Fischer, FB05, University of Bremen 15. Ahmed Gadelmawla, FB05, University of Bremen 16. Stefan Gasow, FB04, University of Bremen 17. Imke Girßmann, BYRD 18. Onur Görmüs, FB04, University of Bremen 19. Britta Hinz, MAPEX 20. Bernhard Karpuschewski, FB04, IWT 21. Susan Köppen, FB04, University of Bremen 22. Nele Kuhn, Diversity Management, University of Bremen 23. Huixin Li, FB04, ZARM, University of Bremen 24. Yang Liu, FB04, bime, University of Bremen 25. Frieder Lucklum, FB01, IMSAS, University of Bremen 26. Hanna Lührs, MAPEX 27. Hanfang Ma, MAPEX 28. Eric Macke, FB04, University of Bremen 29. Markus Murawski, FB04, University of Bremen 30. Bünyamin Musluoglu, University of Bremen 31. Ilya Okulov, FB04, IWT 32. Svetlana Ortmann-Ishkina, FB04, University of Bremen 33. Arouna Patouossa Mounchili, FB04, University of Bremen 34. Georg Pesch, FB04, University of Bremen 35. Christina Plump, FB03, University of Bremen 36. Feixiong Rao, FB04, ZARM, University of Bremen 37. Sina Reede, FB01, IMSAS, University of Bremen 38. Manuela Romero, FB04, University of Bremen 39. Christian Schenck, FB04, University of Bremen 40. David Steinebrunner, FB02, University of Bremen 41. Dirk Stöbener, FB04, BIMAQ 42. Jorge Adrian Tapia Burgos, FB02, University of Bremen 43. Magdalena Thode, FB04, ZARM, University of Bremen 44. Julia Tielke, FB04, ZARM, University of Bremen 45. Lena Weber, FB01, University of Bremen 46. Arne Wittstock, FB02, University of Bremen

8th MAPEX Early Career Researcher Workshop

With the aim of “building bridges” across faculties and institutes, the event seeks to encourage early stage researchers to boost their careers through interdisciplinary exchange. In the workshop, invited keynote presentations will pave the way for short lightning talks and extended poster sessions to allow open discussions and networking. The workshop is a good platform to … • get in touch with peers, build up your own network of experts; • learn from others, think outside the box; • open doors to other experts – become aware of the huge potential for

mutual support that you can access on the short way; • develop ideas for cooperative research projects; • discover the offers for early career researchers by BYRD; • learn what to consider when publishing pre-prints or open access.